[MAINTENANCE] Add name to batch config

[tyler-hoffman]

Adds name to BatchConfig. This will allow for individual named files in a new gx/batch_config/ directory, and allow for bindings to have the yaml shape

name: my_binding
batch_config: <fk_to_batch_config>
expectation_suite: <fk_to_expectation_suite>

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• PR title is prefixed with one of: [BUGFIX], [FEATURE], [DOCS], [MAINTENANCE], [CONTRIB]
• Code is linted - run invoke lint (uses black + ruff)
• Appropriate tests and docs have been updated

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